P.A. Semi
| Industry | Fabless semiconductor company | 
|---|---|
| Founded | 2003 | 
| Founder | Daniel W. Dobberpuhl | 
| Defunct | 2008 | 
| Fate | Acquired by Apple | 
| Headquarters | , | 
| Products | PWRficient processor | 
| Number of employees | 150 person engineering team | 
| Website | pasemi.com at the Wayback Machine (archived September 27, 2007) | 
P. A. Semi (originally Palo Alto Semiconductor) was an American fabless semiconductor company founded in Santa Clara, California in 2003 by Daniel W. Dobberpuhl, who was previously the lead designer for the DEC Alpha 21064 and StrongARM processors. The company employed a 150-person engineering team which included people who had previously worked on processors like Itanium, Opteron and UltraSPARC. Apple Inc acquired P.A. Semi for $278 million in April 2008.
P.A. Semi developed the PWRficient PA6T-1682M CPU, which was used in the AmigaOne X1000.